use Workers Assets based cache for the blog example

[vicb]

Using kvIncrementalCache would generate an error on preview because there is no KV binding configured.

Fixing by switching to Assets because the blog is static.

[changeset-bot]

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Latest commit: a5afc37

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/@opennextjs/cloudflare@558

commit: a5afc37

[vicb]

Thanks James!